community/developer-guide/cpp-format-code.md

---
{
    "title": "C++ Format Code",
    "language": "en"
}
---

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# C++ code formatting

Doris uses clang-format for code formatting, and provides a package script in the build-support directory:

* `clang-format.sh`.

    Format the C/C++ code in the `be/src` and `be/test` directories.

* `check-format.sh`.

    Check the C/C++ code format in the `be/src` and `be/test` directories, and output diff, but the content of the file will not be modified.

## Code style customization

The code style of Doris is slightly modified on the basis of Google Style and is customized as a `.clang-format` file located in the root directory of Doris.

Currently, the `.clang-format` configuration file is adapted to versions above clang-format-16.0.0.

The code that you do not want to be formatted is recorded in the `.clang-format-ignore` file. These codes usually come from third-party code bases, and it is recommended to keep the original code style.

## Environmental preparation

You need to download and install clang-format, or you can use the clang-format plug-in provided by IDE or Editor, as described below.

### Download and install clang-format

The current doris uses clang-format 16 for code formatting (different versions of clang-format may produce different code formats).



Linux: You can use the LDB toolchain directly, which already comes with a corresponding version of clang-format. Or install or compile the binary by yourself in other ways.

Mac: `brew install clang-format@16`

LDB toolchain:

If you are using [LDB toolchain](/docs/install/source-install/compilation-with-ldb-toolchain),
the latest version (>= v0.18) of [LDB toolchain](https://github.com/amosbird/ldb_toolchain_gen/releases) has already included clang-format with 16.0.0 version.

### clang-format plugin

Clion IDE can use the plug-in "ClangFormat", search and download in `File->Setting->Plugins`. However, you need to confirm whether the clang-format version is 16.

## How to use

### Command line operation

cd to the root directory of Doris, and then execute the following command:

`build-support/clang-format.sh`

> Note: The `clang-format.sh` script requires python 3 to be installed on your machine

### Use clang-format in IDE or Editor

#### Clion

If Clion uses a plug-in, just click `Reformat Code`.

#### VS Code

VS Code needs to install the extension Clang-Format, but you need to provide the location of the clang-format execution program.

Open the VS Code configuration page, directly search for "clang_format", and fill in

```
"clang_format_path": "$clang-format path$",
"clang_format_style": "file"
```

Then, right-click on `Format Document`.